Is Tokyo Seimitsu (Accretech) profitable in 2026?

Yes. For FY2026/3 (ended March 31, 2026), Tokyo Seimitsu reported net sales of ¥166,839M and operating profit of ¥33,738M, an operating margin near 20.2%. Net profit attributable to owners was ¥24,739M, down about 3.5% year over year despite the sales growth.

Who is Tokyo Seimitsu's biggest competitor?

DISCO Corporation, a larger Japanese rival estimated to hold roughly 60 to 80 percent of the dicing equipment market and 40 to 60 percent in backgrinding as of September 2025. Tokyo Seimitsu (Accretech) operates as the smaller, profitable number-two player in this dicing and grinding niche.

Could AI replace Tokyo Seimitsu (Accretech)?

No. Its core business is physical wafer probing, dicing, and grinding equipment, which AI software cannot substitute. Instead, AI is a demand driver: management tied Generative AI and HPC-related sales to roughly 45 to 50 percent half-on-half growth heading into FY2026 1H, via HBM probers and packaging grinders.

Who owns Tokyo Seimitsu (Accretech)?

It is an independent publicly traded Japanese company, listed on the Tokyo Stock Exchange Prime Market under code 7729, with a market cap of roughly JPY 599 to 772 billion (about $4 to 5 billion) as of July 2026. There is no parent company or reported ownership change.

Why has Tokyo Seimitsu's stock been so volatile in 2026?

Its 52-week share price range spanned roughly ¥7,951 to ¥21,310 as of July 2026, with a single-day drop near 9.8% and a weekly decline over 11% reported on July 29, 2026, reflecting sensitivity to AI-chip capex sentiment and reported delays in HBM3E to HBM4 customer spending.

What is driving Tokyo Seimitsu's revenue growth?

AI and HBM-related demand. Management said Generative AI and HPC-related sales were expected to grow 45 to 50 percent half-on-half into FY2026 1H, driven by wafer probers for HBM testing and grinders for AI advanced packaging, alongside a new Nagoya plant built for hybrid-bonding equipment.

Semiconductor companies · Japan

Tokyo Seimitsu (Accretech)

accretech.jp ↗

Japanese maker of wafer probers, dicing saws, and grinders for chipmakers.

Defensible for now

Assessed 30 July 2026 · Evidence as of 30 July 2026

Real protection, with named pressure against it.

On the recordSince 30 July 2026 · Checkable from August 4, 2026 · Every call on the record Checkpoint: Q1 FY2027/3 earnings report covering HBM capex order signals

The call

A profitable second-place supplier riding real AI chip capex, but stuck behind DISCO's dominant dicing share and exposed to HBM capex timing swings.

Tokyo Seimitsu makes machines that cut, grind, and probe semiconductor wafers for chip makers. It is hard to replace because customers qualify these machines carefully and often need backup suppliers, which keeps Tokyo Seimitsu in second place behind DISCO, which controls most of the dicing market. The big question is whether the AI chip boom actually continues on schedule, because if capex delays stretch beyond 2027, orders could dry up fast and the stock could swing wildly.

Why

AI pressure: None apparent. AI chip demand feeds them directly through HBM and advanced packaging capex, it does not threaten their tools. Could AI do the core job? Unlikely.

Bigger players: DISCO Corporation. DISCO holds an estimated 60 to 80 percent of dicing share and 40 to 60 percent of backgrinding, leaving this company a distant number two. Could a giant copy it? Probably.

What protects it. Fabs must qualify equipment vendors before use, so once tools pass qualification at TSMC or Samsung, switching costs keep orders sticky.

What would change this call

Tokyo Seimitsu's 1Q FY2027/3 earnings report on August 4, 2026 shows order trends. Weak orders would confirm HBM capex timing is hurting demand, not just DISCO competition.
Any leading-edge fab (TSMC/Samsung) qualifies a Chinese dicing or grinding vendor. Would show low-cost entrants breaking into qualification lock-in that protects Tokyo Seimitsu.
Hybrid-bonding mass production ramp timing in FY2027/3 second half. Delay would signal cyclical demand weakness beyond normal HBM3E to HBM4 transition.

Key numbers

FY2026/3 sales grew ~10.8% to ¥166,839M (2026-03-31)
FY2026/3 operating margin ~20.2% (2026-03-31)
FY2026/3 net profit fell ~3.5% to ¥24,739M despite sales growth (2026-03-31)

Named risks

HBM3E to HBM4 customer capex delayed beyond initial forecasts as of mid-2026. Severity: high
Extreme stock volatility, with 52-week range from ¥7,951 to ¥21,310. Severity: high
DISCO Corporation's dominant 60 to 80 percent dicing share caps upside. Severity: medium
Chinese low-cost dicing and grinding entrants seeking qualification at leading fabs. Severity: medium
Japan seismic exposure, illustrated by July 28, 2026 Kyushu magnitude 7.1 earthquake. Severity: low

Rivals, as read in July 2026

Rival	Direction	Evidence
DISCO Corporation	losing to	Holds an estimated 60 to 80 percent dicing share and 40 to 60 percent backgrinding share as of Sep 2025
Kulicke & Soffa	contesting	Named as a dicing and packaging equipment competitor in industry comparisons
Chinese equipment makers	gaining on	Cited as emerging lower-cost threat in dicing and grinding, watched for fab qualification progress
Applied Materials / Lam Research	contesting	Adjacent wafer-fab equipment giants that could technically encroach on dicing/grinding steps

Questions people ask

Is Tokyo Seimitsu (Accretech) profitable in 2026?: Yes. For FY2026/3 (ended March 31, 2026), Tokyo Seimitsu reported net sales of ¥166,839M and operating profit of ¥33,738M, an operating margin near 20.2%. Net profit attributable to owners was ¥24,739M, down about 3.5% year over year despite the sales growth.
Who is Tokyo Seimitsu's biggest competitor?: DISCO Corporation, a larger Japanese rival estimated to hold roughly 60 to 80 percent of the dicing equipment market and 40 to 60 percent in backgrinding as of September 2025. Tokyo Seimitsu (Accretech) operates as the smaller, profitable number-two player in this dicing and grinding niche.
Could AI replace Tokyo Seimitsu (Accretech)?: No. Its core business is physical wafer probing, dicing, and grinding equipment, which AI software cannot substitute. Instead, AI is a demand driver: management tied Generative AI and HPC-related sales to roughly 45 to 50 percent half-on-half growth heading into FY2026 1H, via HBM probers and packaging grinders.
Who owns Tokyo Seimitsu (Accretech)?: It is an independent publicly traded Japanese company, listed on the Tokyo Stock Exchange Prime Market under code 7729, with a market cap of roughly JPY 599 to 772 billion (about $4 to 5 billion) as of July 2026. There is no parent company or reported ownership change.
Why has Tokyo Seimitsu's stock been so volatile in 2026?: Its 52-week share price range spanned roughly ¥7,951 to ¥21,310 as of July 2026, with a single-day drop near 9.8% and a weekly decline over 11% reported on July 29, 2026, reflecting sensitivity to AI-chip capex sentiment and reported delays in HBM3E to HBM4 customer spending.
What is driving Tokyo Seimitsu's revenue growth?: AI and HBM-related demand. Management said Generative AI and HPC-related sales were expected to grow 45 to 50 percent half-on-half into FY2026 1H, driven by wafer probers for HBM testing and grinders for AI advanced packaging, alongside a new Nagoya plant built for hybrid-bonding equipment.

Timeline

2026-07-29Stock drops ~9.8% in a day, over 11% for the week amid capex sentiment swings
2026-07-28Magnitude 7.1 earthquake hits Kyushu, Japan; no confirmed impact on facilities
2026-06-30Management flags HBM3E to HBM4 capex delays; hybrid bonding output eyed for FY2027/3 2H
2026-03-31FY2026/3 closes: net sales ¥166,839M, operating profit ¥33,738M, net profit ¥24,739M
2025-08-31New Nagoya Plant completed for hybrid-bonding and Si back grinders
2025-04-01New mid-term business plan (through FY2027/3) launched, targeting AI-driven demand
2025-03-31FY2025/3 closes: net sales ¥150,534M, net profit ¥25,637M
2025-03-30Company reports consolidated headcount of 3,333 employees
2024-03-31FY2024/3 closes: net sales ¥134,680M, operating profit ¥25,307M

Revision history

30 July 2026

First assessed. Defensible for now. The text above is fixed as of this date and is not edited afterwards.

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